itll be cheaper to buy a new rain suit terus like from givi or hevik etc riding pants (waterproof or not) aint cheap.

but if u insist on a waterproof & breathable riding pants...alpinestars has 1 model thats RM899 and another at RM1099...available at bikeworld...kepong branch tend to have weekend sales so watch out for whats on sale on their fb page.

Clover has one at rm1k... bikequest is the shop u wanna go to.

i have the 1099 one (andes V3 is the model iinm) and just tested it..works great.

also, without rain coat, water will still get in and wet ur undies. with raincoat can still happen but lesser.